화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.16, No.5, 852-858, September, 2010
DOI10.1016/j.jiec.2010.03.012  Export Citation
Investigation of nitric acid treatment of activated carbon for enhanced aqueous mercury removal
Hadi ShamsiJazeyi, and Tahereh Kaghazchi†
  • Center of Excellence for Petro-Chemistry, Department of Chemical Engineering, AmirKabir University of Technology, P.O. Box 15875-4413 No. 424, Hafez Ave, Tehran, Iran
E-mail:
In the present work, Hg(II) adsorption of a commercial activated carbon with and without nitric acid treatment was compared in a batch system. Iodine adsorption test and nitrogen adsorption and desorption experiments were carried out to investigate the changes in porous characteristics during acid treatment. Although the results for iodine adsorption of two samples were approximately similar, the increase in porous characteristics during acid treatment was determined bymicropore volume and total pore volume of treated and untreated samples. To evaluate the effects of acid treatment on the surface functional groups, FTIR analysis for both types of activated carbons was performed, and showed oxidized surface for treated sample. Furthermore, composition of the gaseous by-product resulted from this treatment has been qualitatively analyzed using a FTIR device. Consequently, NO, NO2, N2O4, N2O, CO, and CO2 were detected. Kinetic and equilibriumadsorption studies were performed considering effective parameters, including contact time, initial pH, and initial concentration. It can be seen that nitric acid treatment of activated carbon has enhanced Hg(II) adsorption capacity. Moreover, kinetic studies showed faster adsorption rate for treated activated carbon through changes in external surface rather than internal.
Keywords:Nitric acid treatment;Activated carbon;Adsorption;Mercury;Surface functional group
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